Lesson objective: Identify if a whole number is even or odd by decomposing it into groups and utilizing the strategies of counting by twos and pairing.

This lesson provides an opportunity for students to apply their knowledge and understanding of even and odd numbers to a real-life situation. Students are asked to determine if sets of beads are even or odd in order to determine which bead sets are on sale at the LearnZillion Craft Store. By decomposing each number into groups and utilizing the strategies of counting by twos and pairing, students will get to explore which beads sets are even and which are odd.

Key Concept students will use:

- We can count by twos or pair objects to determine whether there is an odd or even number in a group.

Skills students will use:

- Whole numbers can be decomposed into other whole numbers. (Grade 1, Unit 6)
- We can divide a whole number up into two groups or two addends by giving each group one item until there are no items left to share. (Grade 1, Unit 6)
- Whole numbers are either even or odd. Even numbers are the sum of two equal whole addends, and odd numbers are not.

Students engage in Mathematical Practice 7 (Look for and make use of structure) as they decompose each number by counting by twos or making pairs to determine if the number is even or odd.

**Key vocabulary: **

- decompose
- even
- odd
- pair
- sum

**Special materials needed:**

- counters (or an alternative manipulative that students could use to model their counting with)